using System.Collections.Generic;
using TMPro;
using UnityEngine;

namespace AibisDream.Framework
{
    [CreateAssetMenu(fileName = "TypographyProfile", menuName = "AIBIS Dream/Typography/Profile")]
    public sealed class TypographyProfile : ScriptableObject
    {
        [SerializeField] private TypographyProfileKind profileKind;
        [SerializeField] private List<TypographyStyle> styles = new();

        public TypographyProfileKind ProfileKind => profileKind;
        public IReadOnlyList<TypographyStyle> Styles => styles;

        public TypographyStyle Resolve(TypographyRole role)
        {
            TypographyStyle body = null;
            if (styles == null)
                return null;

            foreach (TypographyStyle style in styles)
            {
                if (style == null || !style.IsUsable)
                    continue;

                if (style.Role == role)
                    return style;
                if (style.Role == TypographyRole.Body)
                    body = style;
            }

            return body;
        }

        public IEnumerable<string> GetValidationErrors()
        {
            if (styles == null || styles.Count == 0)
            {
                yield return $"{name}: 没有配置任何 TypographyStyle。";
                yield break;
            }

            var seenRoles = new HashSet<TypographyRole>();
            foreach (TypographyStyle style in styles)
            {
                if (style == null)
                {
                    yield return $"{name}: 存在空的 TypographyStyle。";
                    continue;
                }

                if (!seenRoles.Add(style.Role))
                    yield return $"{name}: Role {style.Role} 重复配置。";
                if (!style.IsUsable)
                    yield return $"{name}: Role {style.Role} 没有字体。";
            }

            if (!seenRoles.Contains(TypographyRole.Body))
                yield return $"{name}: 缺少 Body 回退样式。";
        }

        public void Configure(TypographyProfileKind kind, IEnumerable<TypographyStyle> configuredStyles)
        {
            profileKind = kind;
            styles = configuredStyles != null
                ? new List<TypographyStyle>(configuredStyles)
                : new List<TypographyStyle>();
        }

        internal void ApplyFallbacks()
        {
            if (styles == null)
                return;

            var configuredFonts = new HashSet<TMP_FontAsset>();
            foreach (TypographyStyle style in styles)
            {
                if (style?.Font != null && configuredFonts.Add(style.Font))
                    style.ApplyFallbacks();
            }
        }
    }
}